update() function
- added pip python packages update
- gem doesn't use sudo, better for rvm

TODO should add a bit of echo where there's no feedback
update .brew script, added .path with sensible homebrew paths
Modify osx to avoid overriding important defaults like system name or
timezones.Modify and uncomment lines as needed
prompt: ansi colors + return status indicator
bootstrap.sh à la spf13: uses symlinks instead of rsync
.osx and .brew moved to init/osx, init/brew as it makes more sense
Monokai Soda color theme